2 sets of heads for sb. can you help?
Seriously... every head porter you talk to will say something different than the other.
air speed can be your worst enemy, or it can pull signal on a much larger carb [like mentioned/think buick engines] and make it work though out the range as well as make more hp in the upper rpms.
I have talked to & argued with many head porters including hughes, they don't want to do old heads...they want to sell you new heads... plain and simple.
there are cnc programs that the major name shops-indy/hughes/davorak that take the work out of hand porting but they can make more with selling you new heads-mark up and ease in exploiting the potential.
One thing I don't do is blab, i'm not a cheerleader on the side lines of my favorite team...I'm just the guy with lil money trying to get it done and fact finding the flow potential 'rumors' of these old dinosaur bones and weighing the diff in ways.
Some people will talk a good game and throw this and that seemingly logical explanation at you to till yer handing them money and calling them a GURU.
The people with flow benches are the last to weigh in on these discussions I notice......
guess these heads aren't new enough and can't be figured into the bill.lol
I have had my 'Home made flow bench" for a couple of years now.
And you learn a lot chasing your tail for cfm and air speed.
I have got in trouble with my wife, chasing air speed tell 5 in the morning, too many time, to count :toothy10:
It has become an addiction!
AND I STILL KNOW VARY LITTLE!
340plot, is this a 318(us the 302's) or 340? us the 360 heads.
Which ever one you us, clean up the in perfection in the casting(Don't port them!) and have a 3 or 4 angle valve job.(this is the simples, cheapest,and fastest cfm improvement for either head.)
And you will be happy with them.
340plotWere do you live?
Somthing tells me, them cast iron head, would kill me in shipping charges.